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Beta Cassiopeiae
Beta Cassiopeiae (β Cas, β Cassiopeiae) is a Delta Scuti variable star in the constellation Cassiopeia. It is a subgiant or giant star belonging to the spectral class F2. The white star of second magnitude (+2.27 mag) has an absolute magnitude of +1.16 mag. It has the traditional name Caph, from the Arabic word ', "palm" (''i.e.'' reaching from the Pleiades).
==Visibility==
With a mean apparent magnitude (V-band) of +2.27, it is one of the five stars which make up the 'W' of Cassiopeia, adjacent to the just brighter Schedar (Alpha Cassiopeiae).〔 SN 1572, traditionally known as Tycho's Star, appeared about 5 degrees to the northwest of Caph in 1572.〔
As a star in the deep northern hemisphere of the sky, Beta Cassiopeiae is prominent to viewers in the northern hemisphere but not often seen by those in the southern hemisphere. The constellation of Cassiopeia does not rise above the horizon to viewers in Tasmania, and only low if one were in Cairns.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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